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External JavaScript

                  JavaScript code can be written in a file and saved with the .js extension and this file can then be linked
                  inside the <head> and </head> tags of the HTML document in which we want to add this code. The
                  SRC attribute of the <script> tag allows to give path of the JavaScript file. The syntax to add external
                  JavaScript is:

                  <HEAD>
                  <SCRIPT TYPE="text/javascript" SRC="D:\first.js">
                  </SCRIPT>

                  </HEAD>
                  Note that there are many other scripting languages, hence, it is recommended to use the TYPE
                  attribute with the <SCRIPT> tag and set its value to text/javascript to specify that scripting language
                  we are using.


                         CREATING A WEB PAGE WITH INTERNAL JAVASCRIPT


                  Similar to HTML5 web page, we can use any text editor like Notepad, Visual Studio Code, Sublime
                  Text, etc. to create JavaScript programs. After typing the JavaScript code, any web browser like
                  Google Chrome, Firefox, Microsoft Edge, etc. are used to view the web page. Let us create a web
                  page using internal JavaScript.

                  Follow the given steps to create JavaScript program:
                  Step 1:        Type <script type = “text/javascript”> between the <HEAD> and </HEAD> tags to use
                              JavaScript.

                  Step 2:        Use the alert( ) method to display virtual alert box that contains some specified message
                              and an OK button.


                  <HTML>

                  <HEAD>
                  <TITLE> My First JavaScript </TITLE>

                  <SCRIPT TYPE="text/javascript">

                  alert("Hello World!");

                  </SCRIPT>

                  </HEAD>

                  <BODY>

                  This message box is displayed using JavaScript.

                  </BODY>

                  </HTML>



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